The internet doesn't provide a great example for what people think of you. The impersonal nature of it and the relative anonymity it offers tends to bring out the worst in a lot of people, allowing them to say or do things they would be far more hesitant to do or say in person. I've taken to trying to just ignore or outright avoid the internet hate machine when I see it flaring up somewhere, which works out most of the time but occasionally I still get drawn in to some degree or another.
If nothing else I suppose all of the negativity on the Internet makes for a nice contrast when you do run into cool people you enjoy talking to—most of the time, at least, as it's nigh impossible to find someone you'll never have even a minor clash with on occasion, but that's fine so long as people can cool down and let it pass.